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ca43893567
Summary: This is exposed by functional testing on PowerPC. In some pipelined loops, Phi refer to phi did not get value defined by the Phi, hence getting wrong value later. As the comment mentioned, we should "use the value defined by the Phi, unless we're generating the firstepilog and the Phi refers to a Phi in a different stage.", so Phi refering to same stage Phi should use the value defined by the Phi here. Reviewers: bcahoon, hfinkel Reviewed By: hfinkel Subscribers: MaskRay, wuzish, nemanjai, hiraditya, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D64035 llvm-svn: 365428
35 lines
1.2 KiB
LLVM
35 lines
1.2 KiB
LLVM
; REQUIRES: asserts
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; RUN: llc < %s -mtriple=powerpc64le-unknown-linux-gnu -verify-machineinstrs\
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; RUN: -mcpu=pwr9 --ppc-enable-pipeliner -debug-only=pipeliner 2>&1 \
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; RUN: >/dev/null | FileCheck %s
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define dso_local void @sha512() #0 {
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;CHECK: prolog:
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;CHECK: %16:g8rc = ADD8 %21:g8rc, %20:g8rc
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;CHECK: epilog:
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;CHECK: %23:g8rc_and_g8rc_nox0 = PHI %5:g8rc_and_g8rc_nox0, %bb.3, %18:g8rc_and_g8rc_nox0, %bb.4
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;CHECK-NEXT: %24:g8rc = PHI %6:g8rc, %bb.3, %16:g8rc, %bb.4
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;CHECK-NEXT: %25:g8rc = PHI %6:g8rc, %bb.3, %19:g8rc, %bb.4
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br label %1
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1: ; preds = %1, %0
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%2 = phi i64 [ 0, %0 ], [ %12, %1 ]
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%3 = phi i64 [ undef, %0 ], [ %11, %1 ]
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%4 = phi i64 [ undef, %0 ], [ %3, %1 ]
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%5 = getelementptr inbounds [80 x i64], [80 x i64]* null, i64 0, i64 %2
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%6 = load i64, i64* %5, align 8
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%7 = add i64 0, %6
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%8 = and i64 %3, %4
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%9 = or i64 0, %8
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%10 = add i64 0, %9
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%11 = add i64 %10, %7
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%12 = add nuw nsw i64 %2, 1
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%13 = icmp eq i64 %12, 80
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br i1 %13, label %14, label %1
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14: ; preds = %1
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%15 = add i64 %4, 0
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store i64 %15, i64* undef, align 8
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ret void
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}
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